First principles molecular dynamics simulations reveal a liquid-liquid phasetransition in supercooled elemental silicon. Two phases coexist below$T_c\approx 1232K$. The low density phase is nearly tetra-coordinated, with apseudogap at the Fermi surface, while the high density phase is more highlycoordinated and metallic in nature. The transition is observed through theformation of van der Waals loops in pressure-volume isotherms below $T_c$.
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